URLSession works for request but not NWConnection

I am trying to convert a simple URLSession request in Swift to using NWConnection. This is because I want to make the request using a Proxy that requires Authentication. I posted this SO Question about using a proxy with URLSession. Unfortunately no one answered it but I found a fix by using NWConnection instead.

Working Request

func updateOrderStatus(completion: @escaping (Bool) -> Void) {
    let orderLink = "https://shop.ccs.com/51913883831/orders/f3ef2745f2b06c6b410e2aa8a6135847"
 
    guard let url = URL(string: orderLink) else {
        completion(true)
        return
    }
 
    let cookieStorage = HTTPCookieStorage.shared
    let config = URLSessionConfiguration.default
    config.httpCookieStorage = cookieStorage
    config.httpCookieAcceptPolicy = .always
    let session = URLSession(configuration: config)
    var request = URLRequest(url: url)
    request.httpMethod = "GET"
 
    request.setValue("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", forHTTPHeaderField: "Accept")
    request.setValue("none", forHTTPHeaderField: "Sec-Fetch-Site")
    request.setValue("navigate", forHTTPHeaderField: "Sec-Fetch-Mode")
    request.setValue("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Safari/605.1.15", forHTTPHeaderField: "User-Agent")
    request.setValue("en-US,en;q=0.9", forHTTPHeaderField: "Accept-Language")
    request.setValue("gzip, deflate, br", forHTTPHeaderField: "Accept-Encoding")
    request.setValue("document", forHTTPHeaderField: "Sec-Fetch-Dest")
    request.setValue("u=0, i", forHTTPHeaderField: "Priority")
    
    // make the request
}

Attempted Conversion

func updateOrderStatusProxy(completion: @escaping (Bool) -> Void) {
    let orderLink = "https://shop.ccs.com/51913883831/orders/f3ef2745f2b06c6b410e2aa8a6135847"
 
    guard let url = URL(string: orderLink) else {
        completion(true)
        return
    }
    
    let proxy = "resi.wealthproxies.com:8000:akzaidan:x0if46jo-country-US-session-7cz6bpzy-duration-60"
    let proxyDetails = proxy.split(separator: ":").map(String.init)
    guard proxyDetails.count == 4, let port = UInt16(proxyDetails[1]) else {
        print("Invalid proxy format")
        completion(false)
        return
    }
 
    let proxyEndpoint = NWEndpoint.hostPort(host: .init(proxyDetails[0]),
                                            port: NWEndpoint.Port(integerLiteral: port))
    let proxyConfig = ProxyConfiguration(httpCONNECTProxy: proxyEndpoint, tlsOptions: nil)
    proxyConfig.applyCredential(username: proxyDetails[2], password: proxyDetails[3])
 
    let parameters = NWParameters.tcp
    let privacyContext = NWParameters.PrivacyContext(description: "ProxyConfig")
    privacyContext.proxyConfigurations = [proxyConfig]
    parameters.setPrivacyContext(privacyContext)
 
    let host = url.host ?? ""
    let path = url.path.isEmpty ? "/" : url.path
    let query = url.query ?? ""
    let fullPath = query.isEmpty ? path : "\(path)?\(query)"
 
    let connection = NWConnection(
        to: .hostPort(
            host: .init(host),
            port: .init(integerLiteral: UInt16(url.port ?? 80))
        ),
        using: parameters
    )
 
    connection.stateUpdateHandler = { state in
        switch state {
        case .ready:
            print("Connected to proxy: \(proxyDetails[0])")
 
            let httpRequest = """
            GET \(fullPath) HTTP/1.1\r
            Host: \(host)\r
            Connection: close\r
            Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r
            User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Safari/605.1.15\r
            Accept-Language: en-US,en;q=0.9\r
            Accept-Encoding: gzip, deflate, br\r
            Sec-Fetch-Dest: document\r
            Sec-Fetch-Mode: navigate\r
            Sec-Fetch-Site: none\r
            Priority: u=0, i\r
            \r
            """
 
            connection.send(content: httpRequest.data(using: .utf8), completion: .contentProcessed({ error in
                if let error = error {
                    print("Failed to send request: \(error)")
                    completion(false)
                    return
                }
 
                // Read data until the connection is complete
                self.readAllData(connection: connection) { finalData, readError in
                    if let readError = readError {
                        print("Failed to receive response: \(readError)")
                        completion(false)
                        return
                    }
 
                    guard let data = finalData else {
                        print("No data received or unable to read data.")
                        completion(false)
                        return
                    }
 
                    if let body = String(data: data, encoding: .utf8) {
                        print("Received \(data.count) bytes")
                        print("\n\nBody is \(body)")
                        completion(true)
                    } else {
                        print("Unable to decode response body.")
                        completion(false)
                    }
                }
            }))
 
        case .failed(let error):
            print("Connection failed for proxy \(proxyDetails[0]): \(error)")
            completion(false)
 
        case .cancelled:
            print("Connection cancelled for proxy \(proxyDetails[0])")
            completion(false)
 
        case .waiting(let error):
            print("Connection waiting for proxy \(proxyDetails[0]): \(error)")
            completion(false)
 
        default:
            break
        }
    }
 
    connection.start(queue: .global())
}
private func readAllData(connection: NWConnection,
                         accumulatedData: Data = Data(),
                         completion: @escaping (Data?, Error?) -> Void) {
    
    connection.receive(minimumIncompleteLength: 1, maximumLength: 65536) { data, context, isComplete, error in
        
        if let error = error {
            completion(nil, error)
            return
        }
        
        // Append newly received data to what's been accumulated so far
        let newAccumulatedData = accumulatedData + (data ?? Data())
 
        if isComplete {
            // If isComplete is true, the server closed the connection or ended the stream
            completion(newAccumulatedData, nil)
        } else {
            // Still more data to read, so keep calling receive
            self.readAllData(connection: connection,
                             accumulatedData: newAccumulatedData,
                             completion: completion)
        }
    }
}